You will need to download the EETech for Mac. It includes the EFI bios. Format a USB drive with Mac file system and copy the EFI file to it. You will need to disable to preboot screen and enable preboot USB support in the policy. Once you get in you can Authorize and Authenticate.
As of now there no tool similar WinPE available for Mac platform. you have to use EETech for Mac on USB to decrypt/revmove EEMac , etc on mac.